Abstract
Phase conjugation by degenerate four-wave mixing in the 4-μm region in germanium has been observed for both single-line and multiline radiation. By using single-line output of a DF laser at 3.8 μm, χ3 has been measured to be 4 × 10−11 esu. Phase conjugation of multiline laser output has been achieved with an efficiency of 0.03%, a level that is consistent with the susceptibility found for single-line phase conjugation and the assumption of independent conjugation of each line of the multiline output.
© 1980 Optical Society of America
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